Fractions
Exact arithmetic for whole, proper, improper, and mixed fractions
Builder CalculatorProfessional field calculatorFIELD READY Designed for the jobsite
Turn field
measurements into
materials to buy.
Builder Calculator brings professional construction calculations, project material rollups, supplier comparisons, and quote exports into one offline-first workspace.
✓ English & Chinese✓ Imperial & metric✓ Local-first data
9:41Builder CalculatorPRO
BOARD FEET
Lumber estimate
THICKNESS2 inWIDTH8 inLENGTH10 ftQUANTITY12
ESTIMATED TOTAL160.00board feet
Waste includedCost $67.20
SaveAdd to projectShare
Roof pitch6:12 · 26.6°
Stair layout15 risers9professional calculators
2unit systems
0ads or analytics SDKs
PDFbuy lists and customer quotes
CALCULATE WITH CONFIDENCE
From one measurement to the whole job
Keep the basics fast and complex projects organized. Each tool is designed around real estimating, buying, and construction work.
Length
Fast conversion between feet, inches, and metric units
Area
Rectangle, triangle, and circle area estimates
Volume
Space volume and common capacity conversions
Board Feet
Lumber volume, waste allowance, and cost
Roof Pitch
Pitch ratio, angle, slope percentage, and roof area
Stairs
Risers, treads, stringers, and layout guidance
Concrete
Volume and bag counts for slabs, footings, and columns
Paint
Coverage and container counts after doors and windows
PROJECT READYKeep calculations together.
Keep calculations together.
Buy without omissions.
Save stair, concrete, paint, and lumber calculations to a job. Builder Calculator organizes material quantities while still supporting manual items.
- Automatic material rollups
- Waste and package rounding
- Supplier, price, tax, and product links
- Procurement and customer quote exports
ACTIVE PROJECTBackyard deck rebuild68%
Pressure-treated lumberBoard Feet calculations × 3284.5 bd ftConcreteFootings · 10% waste1.42 yd³Exterior finish2 coats · openings deducted3 cansEstimated project costMaterials + labor + tax$ 4,860
ONE CONTINUOUS FLOW
Less switching. Less re-entry. Traceable results.
Every step connects to the next while preserving the original inputs, calculation time, and project relationship.
Enter jobsite measurements
Use imperial, metric, and common construction fractions without manual conversion.
Get an explained result
See base quantity, waste allowance, purchase quantity, and calculation guidance.
Save it to a project
Bring different calculations into one job and automatically roll up matching materials.
Build the buy list and quote
Compare suppliers and export procurement, CSV, and customer quote PDFs.
Local
first
first
PRIVACY BY DESIGN
Your measurements and projects stay on your device by default.
Builder Calculator currently has no account system, cloud sync, ads, or behavioral analytics. Calculations, projects, quotes, and supplier information are stored locally. System services are used only when you export, share, purchase, or restore a purchase.
BUILDER CALCULATOR 1.0
Get release updatesReady for your next field measurement
iOS and Android releases are being prepared. Official download links will appear here when available.